Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
How to replace chain drive garage door opener.
This garage door opener works by moving gears and metal parts together.
This diy repair guide explains how to replace the drive and worm gears on a chain drive garage door opener.
The worm gear which attaches to the motor shaft meshes with the drive gear to spin the sprocket and drive the chain to open and close the garage door.
How chain and belt drives work.
Screw drives a long threaded rod drives a mechanism that opens and closes the door are priced in the mid range.
This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
It uses a chain running assembly unit attached to tension springs that lift the garage door up.
If the gear and sprocket assembly breaks the motor runs but the door won t move.
If the gears break or strip the door won t move.
These are widely used since they are affordable and easily available.